(refs #7414) Added Dynamic constructor

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / elaboration / java / DynamicConstructor.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/DynamicConstructor.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/DynamicConstructor.java
new file mode 100644 (file)
index 0000000..078e7f6
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/DynamicConstructor.java
@@ -0,0 +1,51 @@
+package org.simantics.scl.compiler.elaboration.java;
+
+import org.cojen.classfile.TypeDesc;
+import org.objectweb.asm.Label;
+import org.simantics.scl.compiler.constants.FunctionValue;
+import org.simantics.scl.compiler.constants.LocalVariableConstant;
+import org.simantics.scl.compiler.internal.codegen.continuations.Cont;
+import org.simantics.scl.compiler.internal.codegen.references.IVal;
+import org.simantics.scl.compiler.internal.codegen.references.Val;
+import org.simantics.scl.compiler.internal.codegen.utils.LocalVariable;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+/**
+ * Dynamic :: a -> Dynamic
+ */
+public class DynamicConstructor extends FunctionValue {
+    private static final TVar A = Types.var(Kinds.STAR);
+    public static final DynamicConstructor INSTANCE = new DynamicConstructor();
+    
+    private DynamicConstructor() {
+        super(new TVar[] {A}, Types.NO_EFFECTS, Types.DYNAMIC, A);
+    }
+
+    @Override
+    public Type applyExact(MethodBuilder mb, Val[] parameters) {
+        mb.pushBoxed(parameters[0]);
+        return Types.DYNAMIC;
+    }
+
+    @Override
+    public void deconstruct(MethodBuilder mb, IVal parameter, Cont success, Label failure) {
+        Type expectedType = success.getParameterType(0);
+        TypeDesc expectedTypeDesc = mb.getJavaTypeTranslator().toTypeDesc(expectedType);
+        TypeDesc expectedObjectTypeDesc = expectedTypeDesc.toObjectType();
+        LocalVariable cachedParameter = mb.cacheValue(parameter, Types.DYNAMIC);
+        mb.loadLocal(cachedParameter);
+        mb.instanceOf(expectedObjectTypeDesc);
+        mb.ifZeroComparisonBranch(failure, "==");
+        
+        mb.loadLocal(cachedParameter);
+        mb.checkCast(expectedObjectTypeDesc);
+        mb.unbox(expectedType);
+        LocalVariable casted = mb.createLocalVariable("dynamicContent", expectedTypeDesc); 
+        mb.storeLocal(casted);
+        mb.jump(success, new LocalVariableConstant(expectedType, casted));
+    }
+}